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arXiv · 1807.03075

Voyager 1 $e^\pm$ Further Constrain Primordial Black Holes as Dark Matter

Mathieu Boudaud·Marco Cirelli
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Abstract

Primordial Black Holes (PBHs) with a mass $M \lesssim {10^{17}}$g are expected to inject sub-GeV electrons and positrons in the Galaxy via Hawking radiation. These cosmic rays are shielded by the solar magnetic field for Earth-bound detectors, but not for Voyager-1, which is now beyond the heliopause. We use its data to constrain the fraction of PBHs to the dark matter in the Galaxy, finding that PBHs with $M<10^{16}$g cannot contribute more than 0.1% (or less for a lognormal mass distribution). Our limits are based on local galactic measurements and are thus complementary to those derived from cosmological observations.

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Mathieu Boudaud, Marco Cirelli. 2018-07-09. Voyager 1 $e^\pm$ Further Constrain Primordial Black Holes as Dark Matter. https://doi.org/10.1103/physrevlett.122.041104

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